package com.Maykk.Demo02;
public class KeyBoard extends USB {
	public void on() {
		System.out.println("键盘被插入了······");
	}
	public void off() {
		System.out.println("键盘被拔出了······");
	}
	public void inputting() {
		System.out.println("键盘正在输入······");
	}
}